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Title: Comment on C. W. Wong, Maxwell equations and the redundant gauge degree of freedom 2009 Eur. J. Phys. 30, 1401-1416

In the paper cited in the title, the author makes the claim that in classical electromagnetic theory the longitudinal electric field is instantaneous, corresponding to action at a distance, contrary to popular and correct belief. We point out that the determination of the speed of propagation of electromagnetic fields requires specification of the initial condition of the sources or equivalent. The Coulomb field of a stationary point charge proves nothing. We describe in detail a simple example to illustrate the universal onset of the static 'instantaneous' regime throughout a region of space that expands with the speed of light.
Authors:
Publication Date:
OSTI Identifier:
979917
Report Number(s):
LBNL-2878E
Journal ID: ISSN 0143-0807; EJPHD4; TRN: US1003406
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: European Journal of Physics
Research Org:
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:
Physics Division
Country of Publication:
United States
Language:
English
Subject:
71; 72; COULOMB FIELD; ELECTRIC FIELDS; ELECTROMAGNETIC FIELDS; MAXWELL EQUATIONS; POINT CHARGE; SPECIFICATIONS; VELOCITY